/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package Controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.util.Hashtable;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author bienphongvnn
 */
@WebServlet(name = "TinhTong", urlPatterns = {"/TinhTong"})
public class TinhTong extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            StringWriter content = new StringWriter();
            content.append("<form action = 'TinhTong' method = 'get'>");
            content.append("<input type = 'text' name = 'so1'/>");
            content.append("<input type = 'text' name = 'so2'/>");
            content.append("<input type = 'submit' value = 'Tinh Tong'/>");
            content.append("</form>");
            content.append("<p color:red;text-align:center><a href = 'http://localhost:8084/LapTrinhWeb/'><< Tro ve trang chu</a></p>");
            if (request.getParameter("so1") != null)
            {
                int a = Integer.parseInt(request.getParameter("so1"));
                int b = Integer.parseInt(request.getParameter("so2"));
                int kq = a + b;
                content.append(String.format("<h2>Tổng: %d + %d = %d</h2>", a, b, kq));
            }
            content.close();
            
            /**
             * Xuất nội dung với một template cho sẵn
             */
            Hashtable<String, String> data = new Hashtable<String, String>();
            data.put("TITLE", "Tính tổng 2 số");
            data.put("CONTENT", content.toString());
            
            String viewPath = "/View/template.html";
            String absolutepath = getServletContext().getRealPath(viewPath);
            String webcontent = MyUltilities.readFile(absolutepath, UTF_8);
            webcontent = MyUltilities.replace(data, webcontent);
            out.println(webcontent);
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
